I would go with a 44 man. 40 fit just fine but I knew if i went to an Eagles game around Nov or Dec I'd want a hoodie underneath so i would want the extra little bit of space. Im the same way with the reeboks too. If you can find one in a 46 go for it but they are extremely hard to find so most of the time i just opt for the 48.

I would think a 40 would be a excellent athletic fit for you.While a 44 would suggest a looser fit that could comfort a hoodie etc under...It really depends on how you like to wear your clothes--to each is own...I suggest measuring under your arm pits around you chest and take those measurements and compare them to what you consider a ideal fit in a jersey. Note that my suggestion would include that these Nike Elites have a kinda funky fit that I personally would suggest a more tailored measurement fit; otherwise, I imagine they can come off as very blocky and clunky kinda if you go for a baggy, bigger size fit. Hope that helps and you now need to purchase one and pay it forward with your impressions of the fit and feel to the next enthusiast.